How it works
A live auction, one round at a time
No silent bids, no single winning number. CapyBidder builds tension round by round — and the longer people stay in, the more your cause raises.
The donate-to-stay mechanic
Every prize is a small auction of its own. Participants take turns in a circle, and on each turn they make one simple choice.
Register for a prize
Each prize is its own mini-auction. Register for the ones you want — there's no opening bid to beat, just a seat at the table.
Decide each round: donate to stay, or exit
When it's your turn, you choose. Donate that round's fee to stay in — a real gift to the cause — and keep playing. Exit and you stop, with nothing more to pay. Every gift you've made supports the nonprofit whether or not you win.
Last one standing wins
Once everyone else has exited, the last one still in takes the prize. Every round along the way added to your cause.
See it in motion
Watch one prize play out
This is the heart of CapyBidder. Round after round, participants decide to donate and stay, or step out. The countdown keeps it lively, the field narrows, and the amount raised climbs with every stay — until one player is left holding the prize.
No single winning bid caps the total. The longer the field stays engaged, the more your cause raises.
Weekend Lake Cabin
Donated by Lakeside Resort · $40 / round
Calm Otter's turn
6 still in
For organizers
You run it from a browser
- Create an event and add your prizes — donor, value, photos, and the fee per round.
- Choose how each prize opens: immediately, on a timer, or manually when you're ready.
- Start the auction from any computer browser and watch the live dashboard.
- When it ends, every winner and invoice is laid out for you, with results emailed automatically.
For participants
They play from their phone
- Browse the active event and register for the prizes you want on your phone.
- When your turn comes, a live countdown appears — donate to stay in, or exit, before it runs out.
- Get a nudge when it's your move, so you never miss a round.
- Win, and you'll see exactly what you owe and how to redeem your prize.
Why it raises more
A traditional auction ends at one person's top bid. CapyBidder keeps everyone engaged: each round, everyone who stays gives again. Ten people who each stay a few rounds can raise far more than a single winning bid — and they have a lot more fun doing it.
One thing worth being clear about: every round you stay in — including the round you join — is a real, non-refundable gift to the cause, paid whether or not you win the prize. That's by design. Only one person takes each prize home, but everyone who played has given something meaningful to the mission along the way.
The experience stays calm while you browse and tense only when it's your turn, so the energy lands exactly where it counts.
Want to run this at your fundraiser?
Plan a beta auction for your nonprofit event, then invite your donors when you are ready.
Plan a beta auction